this one or the sigma 17-50 2.8?

I've owned both. For the obvious, the 17-70 has a more useful FL, while the 17-50 has the constant f/2.8 throughout its range.Physically, the 17-70 takes 72mm filter vs 77mm filters, the weight is lighter by 20% (470g vs 565g) and its a smaller lens which may balance on your APS-C camera better (79mm x 82mm vs 84mm x 92mm). The 17-70 will give you also a psuedo-macro capability at a 1:2.9, which is rather useful.Personally, another point to note (and I've substantiated this myself after coming across it in a few Google blurbs) is that 17mm on the 17-50 is REALLY not 17mm, but 18mm when looked at closely. May not be a deal breaker, but to some it is and the lens really is, in practice, an 18-50 lens. I found the color rendition of the two lenses to be similar (lovely, in fact) and I find the 17-70 to be sharper across the frame at 50mm than the 17-50 is, which is not surprising as that's the farthest reach of the 17-50's FL and it's expected to suffer a tad there. If you haven personally used the new Sigma Contemporary and Art series lenses, I suggest you give them a try. Excellent materials, tight tolerances, well made.I ended up keeping the 17-70f/2.8-4 C and selling the 17-50 f/2.8. I have f/1.8primes to cover the need for low light shooting should it arise, and the extra FL is more important to me

Would this lens be a significant upgrade from a Canon 17-135 IS STM?

The Canon "18-135" IS STM is a OK to Good lens for Video because of the STM. But for Stills it is just OK. There's not a perfect lens out there. I don't buy kit lenses, cause for a little more $$ you get better lenses. BUT, you have to ask yourself, will you change lenses back and forth ? From long zooms/telephoto primes and back to short/medium zooms or primes ? OR, do you like leaving one lens on, or you just don't have a bunch of lenses to switch back & forth. The Sigma starts at 17mm the Canon at 18mm both have barrel distortion, but from 24mm to 70mm, yes the Sigma is better than the Canon, but the Canon has a longer reach to 135mm. DXO Labs has this new Sigma 17-70 Contemporary lens at almost the same numbers/performance as the $1100 Canon 17-55 f/2.8 ! That's how good this lens is. BUT, how well they do on Video Dslr cameras, I don't know ? Hope this helps.

Will it fit the Canon EOS Rebel XS?

Yes. This will fit any EOS with a APS-C crop sensor.So far, I'm in love with this lens. It take real sharp pictures, mostly when stepped down to f4, but at 2.8 it still shines. The OS is a nice feature, but what really stands out in the Macro. Zoomed out to 70mm I can get about 1-2 inches from my subject and the AF snaps into focus quick.

How is the macro? Would you say it's an upgrade from Nikon 18-70 3.5-4.5G?

The Macro can give some fun perspectives foreground to background. As for if it is an upgrade the aperture difference alone is an upgrade as it will allow you to take more pictures with only available light instead of using flash. I love this lens and the glass is great.

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Sigma 17-70mm F2.8-4 Contemporary DC Macro OS HSM Lens for Pentax

Product ID: 238740677

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Details

Brand
Sigma
Focal Length Description
17-70
Lens Type
Macro
Compatible Mountings
Pentax K
Camera Lens Description
70 month

📷F2.8-4 max aperture

🔍0.22m min focus

🛠️USB Dock compatible

Description

📸 Elevate Your Photography Game!

MACRO MAGIC - Get up close and personal with a minimum focus distance of just 0.22m.
STABILIZED SHOTS - Say goodbye to blurry images with advanced image stabilization technology.
PERFECT FOR PENTAX - Designed specifically for APS-C format DSLRs, ensuring optimal performance.
CAPTURE EVERY DETAIL - Experience stunning clarity with a versatile 17-70mm focal range.
FUTURE PROOF YOUR GEAR - Easily update your lens with Sigma's USB Dock compatibility.

The Sigma 17-70mm F2.8-4 Contemporary DC Macro OS HSM Lens for Pentax is a versatile lens designed for APS-C format DSLRs, featuring a maximum aperture of F2.8-4, advanced image stabilization, and a minimum focus distance of 0.22m, making it perfect for both wide-angle and macro photography.

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Sigma 17-70mm F2.8-4 Contemporary DC Macro OS HSM Lens for Pentax

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